Make external survey of the block on existence in it of cracks and corrosion traces. Check boltovy openings on existence of failures of a carving. It is quite good to make also block check on existence of the hidden cracks in the conditions of a repair truck where for this purpose there is a special equipment. In case of detection of defects it is necessary to make block repair (if it is possible) or its replacement.

Check mirrors of cylinders on existence of scratches and задиров.

Measure diameter of everyone of their cylinders in its top part (directly under border of area of step wear), in the middle of height and is closer to the bottom cut. Measurements make in the plane passing through an axis of a cranked shaft.

Measurement of diameter of the cylinder is made to coaxially cranked shaft in three cross-section sections - under border of area of step wear (And), in an average part (In) and over the bottom cut (C).

Then measure diameter of cylinders in the same planes, but across an axis of a cranked shaft. Compare results of measurements to requirements of Specifications.

In the absence of access to exact measuring tools the gap between the piston and walls of the cylinder can be defined (the truth less authentically) by means of special measuring щупа lezviyny type. Shchup should be equipped with a set of edges of various thickness in length about 30.5 cm and to get it it is possible practically in any shop of auto parts.

For definition of a gap choose щуп necessary thickness and enter it between the piston and a cylinder wall. The piston should be located in the cylinder also as it settles down during normal work. The edge щупа is densely entered into a gap between the piston and a cylinder wall on one of persistent surfaces (under 90 ° to an opening under a piston finger).

After edge introduction the piston should slide in the cylinder with moderate resistance.

If the piston fails, or slides too freely, its replacement is required. If jamming of the piston occurs only in the lower part of the cylinder at free sliding above, it is available a cylinder konusnost. Change of density of landing щупа in the cylinder at piston rotation (together with shchupy) in the cylinder speaks about existence of ovality of the last.

Repeat procedure for all remained pistons and cylinders.

At existence on mirrors of cylinders of deep scratches or strong задиров or in a case identification exceeding admissible values of a konusnost or ovality the block should be given to a workshop for a pro-point and a honingovaniye of cylinders. After carrying out a pro-point of cylinders the block complete set is made by pistons and piston rings of the new, repair sizes.

If mirrors of cylinders are found in a satisfactory condition and their wear lies in admissible limits, and also at compliance of sizes of gaps between pistons and walls of their cylinders to requirements of Specifications, the pro-point of cylinders is not required. Everything that should be made - a honingovaniye of mirrors (Undressed Honingovaniye of cylinders).

Engines can be equipped with components of one of three types of the standard size (nominal, with excess and with belittling). For example cylinders can have the size with excess, necks of radical and shatunny bearings - with belittling, and camshaft bearings - with excess. On such engines of a surface of the block, a cranked shaft or a cavity of pushers the digital or alphabetic code specifying the size fabrichno of established pistons is beaten out. On V8 engines on a counterbalance of the eighth crank of the size equipped with necks with belittling of a cranked shaft alphabetic indexes of "M" or «R» are put down. The code «M - 2-3» says that the second and third radical necks have the size with belittling in 0,025 mm while the letter "R" in a code speaks about belittling of the size of shatunny necks.

Engines c nests of pushers of the exceeded size usually are marked by the label which having a form of diamond and has been beaten out on a platform in the top part of a forward wall of the block whereas the index "X", beaten out on a platform at an end face of a head of cylinders means installation of valves with cores of the size with excess (0,127 mm).

The cranked shaft of the V8 engine can be marked with the alphanumeric code which has been beaten out on a counterbalance of the eighth crank and saying that the shaft is equipped radical (the "M" label) or shatunny («R» label) with necks of the size with belittling.

The labels speaking about the equipment by components of the repair sizes of the V8 engine

CONDITION

DESIGNATION

LOCATION OF THE CODE

NECKS OF THE CRANKED SHAFT (THE SIZE WITH BELITTLING) 0,0254 MM (0,001 INCHES)